Convertible bed



3 Sheets-Sheet 1 Filed April 25, 1961 Dec. 10, 1963 A. RAMP ETAL 3,113,324

CONVERTIBLE BED Filed April 25. 1961 3 Sheets-Sheet 2 United States Patent 3,113,324 CQNVERTEBLE BED Ewald A. Karnp, Chicago, and Chester A. Pink, Hig land Park, llll., assignors to The Englander Company, Inc., Chicago, iii a corporation of Delaware Filed Apr. 25, 196i, Ser. No. 105,499 2 Claims. (Cl. -3)

This invention relates generally to articles used in furnishing an abode and particularly to convertible furni ture.

In the past, convertible furniture structures have been most frequently devoted to combining a bed or sleeping facility with a divan or seating facility; and modern, convertible furniture structures of this type incorporate a table to which a backrest is fastened. These furniture structures are furthermore rendered convertible for sleeping use by arranging the bed unit to be horizontally pivotal about some portion of the table and away from the backrest. Satisfactory use of such convertible furniture structures has heretofore been generally limited to the corners of rooms because of the daytime need to conceal the pivot mechanism associated with the table and because of the space required for pivoting of the bed unit.

Accordingly, an important object of the present invention is to provide a furniture structure which is convertible by rectilinear movement.

A further obiect of the invention is to provide a convertible furniture structure which is useful in most parts of a room.

A more general object of the invention is to provide a new and improved convertible furniture structure.

Yet another object of the invention is to provide a convertible furniture structure incorporating a bed unit that is positively locatable in the two extreme positions.

And yet another object of the invention is to provide a convertible furniture structure in which the stationary frame assumes a stable position on the floor of a room.

i'llllll another object of the invention is to provide a convertible furniture structure which is characterized by a neat and tailored appearance.

And still another object of the invention is to provide a furniture structure which is sure and easy of conversion between the two positions of use.

And still another object of the invention is to provide a convertible furniture structure that is both strong and rigid.

Additional objects and features of the invention pertain to the particular structure and arrangements whereby the above objects are attained.

A structure in accord with the invention comprises base frame including parallel channel members laterally spaced apart in fixed relationship, each of the channel members having a substantially horizontal track portion and a vertically formed end portion; legs; a box-like table unit supported partially by the end portions of the channel members and partially by the legs, the table unit extending a substantial distance over the track portions of the channel members spaced apart therefrom; a back rest unit on the table unit; a bed unit rollably supported to cooperate with the base frame, the bed unit being situatable in one position partially underlying the table unit and being situatable in a different position away from the table unit; a first set of rollers supporting the bed unit spaced apart therefrom adjacent the rear edge thereof and operative in the track portions of the channel members; and a second set of rollers supporting the bed unit spaced apart therefrom adjacent the front edge thereof and operative on the floor surface underlying the track portions of the channel members.

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In order that the principles of the invention may be readily understood a single embodiment thereof applied to a double-bed type convertible furniture structure, but to which the application is not to be restricted, is shown in the accompanying drawings wherein:

FIG. 1 is a front perspective view of a convertible furniture structure arranged in accordance with the invention and illustrated in the divan-defining condition;

FIG. 2 is a rear perspective view of the assembly comprising the base frame, the table and the backrest;

H6. 3 is an exploded perspective view of the elements of PEG. 2, additionally showing the headboard of the bed unit;

FIG. 4 is a perspective showing of the bed unit viewed upwardly toward the bottom thereof so as to reveal the various roller assemblies;

FIG. 5 is an enlarged, fragmentary perspective view of the hinge-mounting for the backrest;

FIG 6 is a slightly enlarged, left side elevational view of the arrangement of PEG. 1, the box-like table being shown in section to reveal its detail;

FIG. 7 is a side elevational view similar to the showing of FIG. 6 but illustrating the parts as they would appear in the bed-defining condition;

FIG. 8 is an enlarged, side elevational view in crosssection, taken through one of the channel members of the base frame and showing the operation of the rollers, the divan-defining condition being generally illustrated in solid outline and the bed-defining condition being illustrated in broken outline;

FIG. 9 is a view taken through the section 9-9 of FIG. 8;

FIG. 10 is a view taken through the section 1tl10 of FIG. 8;

FIG. 11 is a view taken through the sectionv 11-11 of FIG. 8; and

FIG. 12. is a view taken through the section 1212 of FIG. 8.

Referring now in detail to the drawings, specifically to FiG. l, a convertible furniture structure indicated generally by the numeral 20 will be seen to include a box-like table unit 22, a backrest unit 24 and a doublebed type unit 26. The furniture structure 20' also includes a base frame unit 28 shown in FIG. 2.

The table unit 22 comprises a relatively large table top 30 that extends as a continuous plane over the entire length and an appreciable proportion of the width of bed unit 26. The table top 30- is desirably fabricated from a suitably finished, furniture wood and has a hollow rectangular storage compartment 32 depending beneath it. As is shown in FIGS. 2 and 3, the compartment 32 defines a chamber 34 which is closured by the swingably mounted backrest unit 24. The compartment 32 also includes a chamber 36 that may remain open as is shown in FIG. 3 to be used for storing magazines and the like, or that may be used to contain a drawer 38 as is shown in FIG. 1. The chambers 34 and 36 are desirably separated by a vertical panel 40.

The front corners of the table unit 22 are supported by legs 42; and a diagonal brace 44 is advantageously fastened between each of the legs 42 and the undersurface of table top 3ft in order to strengthen the mounting of the legs. A vertical, reinforcing support element 46 may be situated longitudinally of the table unit 22 within either or both of the chambers 34 and 36 as is shown in FIGS. 6 and 7.

With reference to FIG. 3, the base frame unit 28 will be seen to include a pair of parallel channel members 48 which are fabricated from a suitable metal such as low carbon steel and which are arranged to have an upwardly opening, U-shaped section. The channel members 48 are laterally spaced apart in fixed relationship by means of a front angle element St] and an upper angle element 52, the elements 5t} and 52 being fabricated from a suitable metal in order to permit welding of the members 48 to the elements 51 and 52. 'In accordance with a feature of the invention, each of the channel members 43 is arranged to possess a substantially horizontal track portion 54 and a vertically formed end portion 56, the angle element 52 being specifically fastened to the ends of the portions 56 and the element 51 being specifically fastened to the ends of the portions 54.

The upper angle element 52 is fastened to the rear of table unit 22 as is shown in FIGS. 6 and 7, being particularly affixed to the floor of compartment 32 as by screws or other suitable fasteners. Thus, the table unit 22 is supported partially by the end portions 56 and partially by the legs 42; and as will be seen in FIGS. 6 and 7, the table unit 22 extends a substantial distance over the track portions 54 spaced vertically thereabove. This cantilevering of the table unit 22 urges the front ends of the track portions 54 in the general direction of an underlying floor surface 60 tending to position the base frame 23 in a stationary position.

In accordance with an important feature of the invention, the substantially horizontal track portions 54 are disposed at a slight rearwardly declining angle as is well shown in FIGS. 6 and 7. Each of the portions 54 is supported at its rear end by a vertically adjustable glide or foot 62; and turning to FIG. 8, a foot 62 will be seen to include a disc 64 preferably surfaced with a resilient material such as rubber. Each disc 64 is connected to the corresponding track portion 54 by a threaded stud 66; and a locknut 68 is desirably provided to secure the foot 62 in position.

Cooperating with the feet 62 in establishing the rearwardly declining angle in the track portions 54 are stop elements 70 indicated in FIG. 3; and returning to FIG. 8, a stop element 70 will be seen to include a vertical plate portion 72 and a horizontal plate portion 74. The vertical plate portion 72 is provided with vertical slots 76, as is shown in FIG. 12;, and these slots cooperate with bolt type fasteners 78 in positioning the front ends of track portions 54 a suitable distance above the surface of floor 60. A resilient pad 80, desirably fabricated from an elastomeric material, may be secured beneath each of the horizontal plate portions 74 for purposes of establishing a non-skid relationship between the stop elements and the floor 60. As will be recognized, the rearwardly reclining angle taken by the track portions 54 may be altered slightly by vertically adjusting the feet 62 and the stop elements 70.

Considering next FIG. 4, the bed unit 26 is seen to include a mattress 82 superposed on a box spring 84. The mattress 82 and the box spring 84 are constructed in accordance with conventional practice and are arranged to be of double-bed size for purposes of the illustrated embodiment. Turning for the, moment to P16. 8, the box spring 84 will be seen to include a lower, rectangular frame 86,. A pair of bracket plates 88 is fastened to the frame 86 by bolts 90; and a rear roller member 92 is rigidly secured to each of the plates 88 in depending relationship. Referring to FIG. 11, a roller member 92 includes a U-shaped bracket 94'with its web welded to the plate 88. Two wheels 96 are rotatably supported on a axle 9-8, which extends between the arms of the bracket 94, a spacer washer 100 separating the wheels 96. It will be noted that the wheels 96 are spaced from the bottom of box spring "8 4 a predetermined vertical distance.

As is shown inFIG. 4, a pair of the roller members 92 are afiixed beneath the box spring 84 adjacent the rear edge thereof; and the wheels 96 of the roller members 9,2 are arranged to operate in the track portions 54 as is shown in FIG. 11. In order to guide the wheels 96 along their respective paths in the track portions .54 and in order. o su e p pe ra k g o the e unit 6 over the base frame 23, a tracking roller member 102 is fastened to each of the plates 88 spaced apart from the roller members 92. With reference to FIGS. 9-10, a tracking roller member 102 is shown to include a bracket 104, the web of which is fixed to the plate 88 by means of welding. The otherwise free ends of the arms of bracket 164 terminate in outwardly extending flanges 108. A roller element 119 is mounted to each of the flanges 1698 by means of a vertical axle 112; and because of the horizontal spacing between each pair of the axles 112, the roller elements are situated outside of the track portion 54 to ride on the outer surfaces of the sidewalls thereof. Making the rollers 11% of a ball bearing type has proved advantageous.

Beginning again with FIG. 4, the front end of the bed unit 26 is shown carrying two rollers units 114; and turning to FIGS. 8 and 12, a roller unit 114 will be seen to include a U-shaped bracket 116 suitably securedto a mounting plate 118, the plate 118 being fastened in turn to the frame 86 as by bolts 120 or other suitable fasteners. An axle 122 extends between the depending arms of bracket 116 to space six wheels 124 a predetermined distance beneath the box spring 84, the spacing of wheels 124 from box spring 84 being greater than the spacing of the wheels 96. Advantageously, the wheels 124 are separated by spacer washers 126.

Since both of the roller members 114 are intended primarily to operate over the floor surface 60 and since the floor surface 60 frequently comprises carpeting, provision of a relatively large number of the wheels 124 has proved advantageous in distributing the weight of the bed unit 26. It will be observed that the axles 122 and the axles 98 are disposed in parallel relationship generally perpendicular to the track portions 54, this being done in order to facilitate rectilinear movement of the bed unit 26 between the divan-defining condition illustrated in FIG. 6 and the bed-defining condition illustrated in FIG. 7. It will be observed that, in the bed-defining condition, the upper surface of bed unit 26 takes a level attitude whereas, in the divan-defining condition, the upper surface of the bed unit 26 declines rearwardly at a slight angle. This latter attitude has proved desirable from the standpoint of providing a comfortable seating surface and is achieved by virtue of the cooperation of the inclined track portions 54 and the differential spacing of the roller members 92 and the roller members 114 beneath the box spring 84.

A headboard element 123, shown in FIG. 3, is desirably fastened to that end of bed unit 26 which is adjacent the outside end of backrest 24. The means for fastening the headboard 128 to the bed unit 26 comprise threaded fasteners 130 extending perpendicularly from the lower end of the legs of the headboard. The fasteners 130 are employed in securing the headboard 128 to bracket elements 132, the bracket elements 132 being, in turn, secured to the undersurface of box spring 84 as is shown in FIG. 4. The outside end of backrest 24 shares a common vertical plane with the end of bed unit 26 in order to permit passage of the headboard 128 between the two positions of the furniture structure 20. The headboard unit 128 defines a comfortable armrest in the divan-defining condition.

In the divan-defining condition, the roller members 114 are intended to reside on the horizontal plate portions 74 of stop elements 70, engagement between the vertical plate portions 74 and the wheels 124 being cushioned by resilient bumpers 136 as is shown in FIG. 8. In order to establish a positive positioning of the roller members 114 and therefore of the bed unit 26 in this position, a detent ridge 138 is raised from the horizontal portion74 a suitable distance from the vertical portion 72 in order to trap the wheels 124 between the detent 138 and the vertical plate 72.

Similar positive positioning of the bed unit 26 in the bed-defining condition is achieved by raising detentridges 140 in the portions 54 spaced apart from the angle element 50 in order to trap the wheels 96 of roller members 92 against the vertical plate portion of the element 50. Advantageously, a resilient bumper 142 is secured to the vertical plate of element 50 in order to cushion the engagement between the wheels 96 and the vertical plate of the element 50.

As is shown in FIGS. 1 and 7, a pull strap 144 is advantageously provided for use in drawing the bed unit 26 from the divan-defining condition into the bed-defining condition. Conveniently, one end of the pull strap 144 is fixed to the underside of box spring 84 adjacent the rear side thereof; and the free end of strap 144 is provided with a grip ring 146 in order to accommodate a persons hand.

As discussed briefly hereinabove, the backrest unit 24 is vertically swingably mounted to the table unit 22 closuring the chamber 34. Advantageously, the backrest unit 24 is provided with a recess 150, as is shown for example in FIG. 3, recess 159 affording a grip for a persons fingers for use in raising the backrest 24.

Considering FIG. 5, the backrest 24 will be seen to include a vertical, wooden plate 152 and a quantity of padding 154 disposed generally frontwardly of the plate 152 in order to define a resilient bolster for supporting the back of a person seated on the bed unit 26 when the structure 20 is disposed in the divan-defining position. An upholstery covering 156 is fashioned over the padding 154 in accordance with conventional furniture construction practices.

The backrest unit 24 is swingably mounted to the table unit 30 by means of a number of hinges 158, each of the hinges 158 comprising an upstanding leaf 160 which is horizontally adjustably mounted to the front edge of table 30 by means of screws 162 and elongated horizontal slots 164. Each of the hinges 158 also includes a cooperating leaf 166 having vertical slots 168 formed therein for vertically adjustably mounting the backrest unit 24 employing, for example screws. It is to be observed that the leaves 160 and 166 are joined by a pintle 170 which is spaced above the upper surface of table 30 to define the hinge axis. Arrangement of the hinge axis to be vertically above the table 30 and beneath the upper surface of the backrest unit 24 permits the leaves of the hinge to act as stops when the backrest unit 24 is in the raised condition. This is shown in FIG. 7. There, it will be observed that the backrest unit 24 does not contact the upper surface of the table 30 in the raised condition. This arrangement of the hinge axis also reduces the moment of inertia of the backrest unit 24 whereby to facilitate raising thereof.

The adjustability in the position of the backrest 24 relative to the table 30, which is achieved by means of the slots 164 and 168 in the hinges 158, permits the backrest 24 to be positioned relative to the bed unit 26 in order to provide a neat and tailored appearance, specifically spacing the lower edge of the backrest unit 24 closely to the upper surface of the bed unit 26.

From the descriptions thus far given, it is apparent that when the furniture structure 20 is arranged as shown in FIG. 6, it is useful for seating one or more persons in a comfortable position, there being a backrest 24 for support of a persons back and there being a rearward declination of the seating surface for additional comfort. It will be apparent that the table top 30 may have lamps and other objects placed on its surface. The entire furniture structure 20 is stable for the seated occupants and for the objects placed on the table because the weight of the bed unit 26, as well as the weight of any person sitting thereon, bears on the base frame 28 urging the feet 62 and the stop elements 7 firmly against the floor surface 60.

To utilize the structure 20 as a bed, it is only necessary to grasp the ring 146 and pull the bed unit 26 forwardly and away from the table unit 22. This pulling force will relocate the bed unit 26 by a rectilinear movement, the roller members 92 riding on the track portions 54 with proper guidance being supplied by the tracking roller members 1&2. The roller members 1114 will similarly be caused to ride over the floor surface 60; and eventually, the bed-defining position illustrated in FIG. 7 will be realized with the roller members 92, being locked in position behind the detents 14h.

Reconversion of the structure 26 to the divan-defining position may be realized by merely pushing the bed unit 26 rearwardly toward and beneath the table unit 22, the detent ridges 146 being readily negotiated by the roller members 92 upon the application of but slight pushing force.

The specific examples herein shown and described should be considered illustrative only. Various changes in structure may occur to those skilled in the art; and these changes are to be understood as forming a. part of the invention insofar as they fall within the spirit and scope of the appended claims.

The invention is claimed as follows:

1. A convertible furniture structure comprising:

(a) base frame means adapted to guide the convertible movement of a bed means of double bed size, said base frame means including parallel channel members laterally spaced apart in fixed relationship, each of said channel members having a substantially horizontal track portion and a vertically extending end portion;

(b) furniture means partially supported by said end portions, including table means defining a horizontal platform and including backrest means attached to said table means, said furniture means extending over said track portions a horizontal distance corresponding to at least half the width of a said double bed sized bed means, said furniture means being vertically spaced from said track portions to pass said bed means in its convertible movements, said backrest means including a bolster element;

(c) bed means of inarticulated, double bed sized construction, said bed means being rollably supported for rectilinear convertible movements guided by said track portions, said movements being between a position of said bed means partially underlying said furniture means and a position of said bed means away from said furniture means;

(d) leg means connected to said table to support said furniture means away from said end portions, including leg members spaced laterally apart by a distance exceeding the length of said double bed sized bed means whereby to pass said bed means in its convertible movements;

(e) first roller means supportingly connected to said bed means and spaced apart therefrom adjacent the rear edge thereof for operation in said track portions;

(f) second roller means supportingly connected to said bed means and spaced apart therefrom adjacent the front edge thereof for operation on a floor surface underlying and supporting said track portions, said bed means bearing on said track portions through said first roller means whereby to hold said base frame means in stationary position;

(g) a pair of opposed tracking rollers for each of said track portions depending from said bed means into rollable engagement with the exterior sidewalls of the corresponding track portion, said tracking rollers being horizontally spaced apart from the corresponding first roller means for stabilizing the convertible movements of said double bed sized bed means, the opposed tracking rollers cooperating with the first and second roller means and with the horizontal track portions to achieve full rollable conversion of said double bed sized bed means Without resorting to scissors linkages and the like;

(It) hinge means mounting said bolster element to be swingable in a vertical are about an axis spaced above the top surface of said platform, said axis being disposed interjacent the top and bottom edges of said bolster element whereby to permit the leaves of said hinge means to act as stops when the bolster element is situated in the raised condition; and

(i) means acting between said bolster element and said platform for vertically adjustably positioning said bolster element relative to the top surface of said platform whereby to proximately locate said bolster element with respect to said bed means in said first mentioned position.

2. A convertible furniture structure comprising:

(a) base frame means adapted to guide the convertible movement of a bed means of double bed size, said base frame means including parallel channel members laterally spaced apart in fixed relationship, each of said channel members having a substantially horizontal track portion and a vertically extending end portion;

([2) furniture means partially supported by said end portions, including table means defining a horizontal platform and including backrest means attached to said table means, said furniture means extending over said track portions a horizontal distance corresponding to at least half the width of a said double bed sized bed means, said furniture means being vertically spaced from said track portions to pass said bed means in its convertible movements, said backrest means including a bolster element;

(c) bed means of inarticulated, double bed sized construction, said bed means being rollably supported for rectilinear convertible movements guided by said track portions, said movements being between a position of said bed means partially underlying said furniture means and a position of said bed means away from said furniture means;

(d) leg means connected to said table to support said furniture means away from said end portions, including leg members spaced laterally apart by a distance exceeding the length of said double bed sized bed means whereby to pass said bed means in its convertible movements;

(6) first roller means supportingly connected to said bed means and spaced apart therefrom adjacent the rear edge thereof for operation in said track portions;

(3). second roller means supportingly connected to said' bed means and, spaced apart therefrom adjacent the front edge thereof for operation on a floor surface underlying and supporting said track portions, said bed means bearing on said track portions through said first roller means whereby to hold said base frame means in stationary position;

(g) a pair of oppose track portions dep rollable engagement with the exterio on, said tracking rollers rt from the correspondbilizing the convertible the corresponding track porti being horizontally spaced apa ing first roller means for sta d tracking rollers for each of said ending from said bed means into i sidewalls of movements of said double bed sized bed means, the opposed tracking rollers cooperating with the first and second roller means and with the horizontal track portions to achieve full rollable conversion of said double bed sized bed means without resorting to scissors linkages and the like;

(h) hinge means mounting said bolster element to said platform for swinging movement in a vertical are about a horizontal axis, said axis being disposed so as to permit the leaves of said hinge means to act as stops when the bolster element is situated in the raised condition; and

(i) means in between said bolster element and cluded in said hinge means and acting said platform for vertical adjustable positioning said bolster element relative to the top surface of said platform whereby to proximately to locate said bolster element with respect to said bed means in said first mentioned position.

References Cited in the file of this patent UNITED STATES PATENTS 

1. A CONVERTIBLE FURNITURE STRUCTURE COMPRISING: (A) BASE FRAME MEANS ADAPTED TO GUIDE THE CONVERTIBLE MOVEMENT OF A BED MEANS OF DOUBLE BED SIZE, SAID BASE FRAME MEANS INCLUDING PARALLEL CHANNEL MEMBERS LATERALLY SPACED APART IN FIXED RELATIONSHIP, EACH OF SAID CHANNEL MEMBERS HAVING A SUBSTANTIALLY HORIZONTAL TRACK PORTION AND A VERTICALLY EXTENDING END PORTION; (B) FURNITURE MEANS PARTIALLY SUPPORTED BY SAID END PORTIONS, INCLUDING TABLE MEANS DEFINING A HORIZONTAL PLATFORM AND INCLUDING BACKREST MEANS ATTACHED TO SAID TABLE MEANS, SAID FURNITURE MEANS EXTENDING OVER SAID TRACK PORTIONS A HORIZONTAL DISTANCE CORRESPONDING TO AT LEAST HALF THE WIDTH OF A SAID DOUBLE BED SIZED BED MEANS, SAID FURNITURE MEANS BEING VERTICALLY SPACED FROM SAID TRACK PORTIONS TO PASS SAID BED MEANS IN ITS CONVERTIBLE MOVEMENTS, SAID BACKREST MEANS INCLUDING A BOLSTER ELEMENT; (C) BED MEANS OF INARTICULATED, DOUBLE BED SIZED CONSTRUCTION, SAID BED MEANS BEING ROLLABLY SUPPORTED FOR RECTILINEAR CONVERTIBLE MOVEMENTS GUIDED BY SAID TRACK PORTIONS, SAID MOVEMENTS BEING BETWEEN A POSITION OF SAID BED MEANS PARTIALLY UNDERLYING SAID FURNITURE MEANS AND A POSITION OF SAID BED MEANS AWAY FROM SAID FURNITURE MEANS; (D) LEG MEANS CONNECTED TO SAID TABLE TO SUPPORT SAID FURNITURE MEANS AWAY FROM SAID END PORTIONS, INCLUDING LEG MEMBERS SPACED LATERALLY APART BY A DISTANCE EXCEEDING THE LENGTH OF SAID DOUBLE BED SIZED BED MEANS WHEREBY TO PASS SAID BED MEANS IN ITS CONVERTIBLE MOVEMENTS; (E) FIRST ROLLER MEANS SUPPORTINGLY CONNECTED TO SAID BED MEANS AND SPACED APART THEREFROM ADJACENT THE REAR EDGE THEREOF FOR OPERATION IN SAID TRACK PORTIONS; (F) SECOND ROLLER MEANS SUPPORTINGLY CONNECTED TO SAID BED MEANS AND SPACED APART THEREFROM ADJACENT THE FRONT EDGE THEREOF FOR OPERATION ON A FLOOR SURFACE UNDERLYING AND SUPPORTING SAID TRACK PORTIONS, SAID BED MEANS BEARING ON SAID TRACK PORTIONS THROUGH SAID FIRST ROLLER MEANS WHEREBY TO HOLD SAID BASE FRAME MEANS IN STATIONARY POSITION; (G) A PAIR OF OPPOSED TRACKING ROLLERS FOR EACH OF SAID TRACK PORTIONS DEPENDING FROM SAID BED MEANS INTO ROLLABLE ENGAGEMENT WITH THE EXTERIOR SIDEWALLS OF THE CORRESPONDING TRACK PORTION, SAID TRACKING ROLLERS BEING HORIZONTALLY SPACED APART FROM THE CORRESPONDING FIRST ROLLER MEANS FOR STABILIZING THE CONVERTIBLE MOVEMENTS OF SAID DOUBLE BED SIZED BED MEANS, THE OPPOSED TRACKING ROLLERS COOPERATING WITH THE FIRST AND SECOND ROLLER MEANS AND WITH THE HORIZONTAL TRACK PORTIONS TO ACHIEVE FULL ROLLABLE CONVERSION OF SAID DOUBLE BED SIZED BED MEANS WITHOUT RESORTING TO SCISSORS LINKAGES AND THE LIKE; (H) HINGE MEANS MOUNTING SAID BOLSTER ELEMENT TO BE SWINGABLE IN A VERTICAL ARC ABOUT AN AXIS SPACED ABOVE THE TOP SURFACE OF SAID PLATFORM, SAID AXIS BEING DISPOSED INTERJACENT THE TOP AND BOTTOM EDGES OF SAID BOLSTER ELEMENT WHEREBY TO PERMIT THE LEAVES OF SAID HINGE MEANS TO ACT AS STOPS WHEN THE BOLSTER ELEMENT IS SITUATED IN THE RAISED CONDITION; AND (I) MEANS ACTING BETWEEN SAID BOLSTER ELEMENT AND SAID PLATFORM FOR VERTICALLY ADJUSTABLY POSITIONING SAID BOLSTER ELEMENT RELATIVE TO THE TOP SURFACE OF SAID PLATFORM WHEREBY TO PROXIMATELY LOCATE SAID BOLSTER ELEMENT WITH RESPECT TO SAID BED MEANS IN SAID FIRST MENTIONED POSITION. 